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Self-Compatibility Studies with Diploid Alsike Clover, Trifolium hybridum L. II. Inheritance of a Self-Compatibility Factor with Gametophytic and Sporophytic Characteristics¹

A type of self-compatibility, differing from the S₁ gene, was observed in diploid alsike clover. A factor, nonallelic to, but modifying the S locus was postulated. This locus was designated as the A locus and was inherited independently of the S locus. The A₁ allele and an allele of the S locus (S₁) interacted to change the compatibility reaction of the pollen from self-incompatibility to self-compatibility. Dominance was not expressed at the A locus. The self-compatibility genotype of the source plant was considered to be A₁A₂S₁S₂. Variation for self-compatibility was continuous, ranging from a single seed per several hundred manipulated florets to 95% of the florets setting seed. I₁, I₂, I₃, and I₄ progenies of self-compatible plants segregated I self-incompatible (SI) 1 self-compatible (SC) plant. One of the sterility allele homozygotes was missing in the SI group of the I₁ progeny. The sporophytic effect was shown also by SI x SC sib crosses. The compatibility reaction of A₁S₁ gametes from a SI source differed from those with a SC origin.

² Geneticist, Crops Research Division, ARS, USDA, and Special Lecturer, Department of Agronomy, Colorado State University.

Received for publication February 24, 1966.